Compress and decompress files and text using Gzip, Deflate, or Zlib in your browser. Shows before/after size and compression ratio. No uploads.
Open Gzip Compress & Decompress → free, no sign-inGzip, Deflate, and Zlib are the compression formats that power the web — virtually every web server uses them to compress responses. The Gzip Compress & Decompress tool lets you compress or decompress files and text directly in the browser, showing you the before and after sizes and the compression ratio. Switch between Gzip, Deflate, and Zlib formats as needed.
Developers inspecting compressed data, verifying that their compression implementation produces the expected output, or working with compressed files outside of a server context.
No tutorials. No learning curve. Open it and get started.
No server uploads. Shows before/after size and compression ratio — so you can immediately see how effective the compression is.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. Gzip Compress & Decompress was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
What is Gzip used for?
Gzip is the standard web compression format — HTTP servers use it to compress responses, reducing bandwidth by 60-80% for text content.
What's the difference between Gzip, Deflate, and Zlib?
All use the same DEFLATE algorithm. Gzip adds a header and checksum. Zlib adds a different wrapper. Raw Deflate is unframed.
Can I decompress HTTP response bodies?
Yes — paste or upload a Gzip-compressed HTTP response body to decompress it.
Is there a size limit?
Processing is local — large files work but may be slow.
What formats can be decompressed?
Gzip (.gz), Deflate, and Zlib compressed data.
Free. Instant. No sign-in. Open it and get the job done.
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